How does KAYAK find such low prices on flights from Ontario to Seattle?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Ontario to Seattle?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$231 CHEAP FLIGHTS from Ontario to Seattle

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Flight Deals

Cheap Flights from Ontario to Seattle

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Ontario to Seattle

Tue, Dec 15 - Mon, Jan 4

7:30 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop Calgary

2:30 pm - 5:45 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

12h 15m2 stops Calgary Edmonton

$349WestJet

Wed, Jan 27 - Thu, Feb 4

6:10 am - 1:40 pmYOW Ottawa-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

2:30 pm - 2:30 pmSEA Seattle/Tacoma Intl-YOW Ottawa

21h 00m1 stop Calgary

$352WestJet

Fri, Dec 4 - Sun, Dec 13

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$376Air Canada

Fri, Dec 4 - Sun, Dec 13

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:05 pm - 6:52 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

8h 47m1 stop Vancouver Intl

$381Air Canada

Sat, Dec 5 - Sat, Dec 12

9:45 am - 3:03 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

8h 18m1 stop Detroit Metropolitan Wayne County

9:50 am - 11:07 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

10h 17m1 stop Detroit Metropolitan Wayne County

$393KLM

Sun, Dec 20 - Tue, Dec 29

5:15 pm - 8:13 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 58mnonstop

8:33 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 32mnonstop

$398Alaska Airlines

Mon, Feb 15 - Sat, Feb 20

5:15 pm - 7:43 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 28mnonstop

8:21 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 44mnonstop

$398Alaska Airlines

Sat, Dec 5 - Sat, Dec 12

6:00 am - 3:03 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

12h 03m1 stop Detroit Metropolitan Wayne County

7:30 am - 9:56 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

11h 26m2 stops Austin Bergstrom Atlanta Hartsfield-Jackson

$402Delta

Sat, Dec 5 - Sat, Dec 12

12:15 pm - 6:43 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 28m1 stop Detroit Metropolitan Wayne County

7:30 am - 9:56 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

11h 26m2 stops Austin Bergstrom Atlanta Hartsfield-Jackson

$402Delta

Wed, Dec 16 - Wed, Dec 30

6:10 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

10h 30m1 stop Calgary

8:33 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 32mnonstop

$421Multiple Airlines

Recent last minute flight deals from Ontario to Seattle

Tue, Nov 10 - Wed, Nov 11

11:36 am - 6:00 amYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

21h 24m2 stops Chicago O'Hare Intl Portland

8:19 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 46mnonstop

$465Alaska Airlines

Tue, Nov 10 - Wed, Nov 11

11:36 am - 6:00 amYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

21h 24m2 stops Chicago O'Hare Intl Portland

8:19 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 46mnonstop

$472Alaska Airlines

Tue, Nov 10 - Wed, Nov 11

7:30 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop Calgary

2:30 pm - 5:45 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

12h 15m2 stops Calgary Edmonton

$500WestJet

Tue, Nov 10 - Wed, Nov 11

7:30 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop Calgary

2:30 pm - 5:45 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

12h 15m2 stops Calgary Edmonton

$573WestJet

Tue, Nov 10 - Mon, Nov 16

7:30 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop Calgary

5:09 pm - 9:52 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

25h 43m1 stop Austin Bergstrom

$617Multiple Airlines

Tue, Nov 10 - Sat, Nov 14

7:30 am - 1:40 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 10m1 stop Calgary

4:27 pm - 9:43 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

26h 16m2 stops Denver Intl San Francisco

$643Multiple Airlines

Sat, Nov 7 - Sat, Nov 14

12:10 pm - 8:59 pmYOW Ottawa-SEA Seattle/Tacoma Intl

11h 49m1 stop Toronto Pearson Intl

7:45 am - 6:45 pmSEA Seattle/Tacoma Intl-YOW Ottawa

8h 00m1 stop Toronto Pearson Intl

$659Air Canada

Sun, Nov 8 - Mon, Nov 23

6:00 am - 12:42 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 42m2 stops Detroit Metropolitan Wayne County Portland

10:52 pm - 11:19 amSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

9h 27m1 stop New York John F Kennedy Intl

$717Delta

Sun, Nov 8 - Mon, Nov 23

6:30 am - 12:42 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

9h 12m2 stops Minneapolis St Paul Portland

8:25 am - 11:57 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

12h 32m1 stop Atlanta Hartsfield-Jackson

$717Delta

Mon, Nov 9 - Mon, Nov 16

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$731Air Canada

Recent direct flight deals from Ontario to Seattle

Fri, Dec 4 - Sun, Dec 13

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$376Air Canada

Thu, Dec 24 - Fri, Jan 8

5:15 pm - 8:13 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 58mnonstop

8:29 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 36mnonstop

$398Alaska Airlines

Fri, Feb 12 - Sun, Feb 21

5:15 pm - 7:43 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 28mnonstop

8:21 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 44mnonstop

$398Alaska Airlines

Mon, Dec 21 - Fri, Jan 8

5:15 pm - 8:13 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 58mnonstop

8:29 am - 4:05 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 36mnonstop

$398Alaska Airlines

Fri, Dec 11 - Mon, Dec 14

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$399Air Canada

Thu, Feb 4 - Mon, Feb 8

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$399Air Canada

Thu, Dec 10 - Sun, Dec 13

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$729United Airlines

Sun, Mar 14 - Fri, Mar 19

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:22 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 37mnonstop

$795United Airlines

Wed, Dec 23 - Sun, Jan 10

6:25 pm - 8:59 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 34mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$847Multiple Airlines

Tue, Dec 15 - Tue, Dec 22

5:15 pm - 7:56 pmYYZ Toronto Pearson Intl-SEA Seattle/Tacoma Intl

5h 41mnonstop

7:45 am - 3:25 pmSEA Seattle/Tacoma Intl-YYZ Toronto Pearson Intl

4h 40mnonstop

$932Multiple Airlines

Useful Info

Low season	January
High season	June
Cheapest flight	$231

Best time to beat the crowds with an average 22% drop in price.

Most popular time to fly with an average 10% increase in price.

Flight from Toronto to Seattle

How does KAYAK find such low prices on flights from Ontario to Seattle?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Seattle.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Seattle?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Ontario to Seattle?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Ontario with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Seattle?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Lynnwood

Centralia

Fife

Lakewood

Westport

Lacey

Mukilteo

Woodinville

Poulsbo

Edmonds

Aberdeen

DuPont

Shoreline

Monroe

Castle Rock

Edgewood

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Return flight

Complete your trip to Seattle with a hotel stay or car rental

Car rentals in Seattle

$231 Find Cheap Flights from Ontario to Seattle - Compare and Save

Cheap Flights from Ontario to Seattle

Recent round-trip flight deals from Ontario to Seattle

Recent one-way flight deals from Ontario to Seattle

Recent last minute flight deals from Ontario to Seattle

Recent direct flight deals from Ontario to Seattle

Good to know

Low season

High season

Cheapest flight

FAQs for booking flights from Ontario to Seattle

Traveling to a place near Seattle?

More options for your flight to Seattle

Complete your trip to Seattle with a hotel stay or car rental

Information on the airport you'll fly into in Seattle

Cabin class types available on flights to Ontario

Find direct flights for Seattle

Flights from domestic origins to Seattle

Flights to other popular destinations

Find deals for your return flight